Export the `host_required` property to module-info

Some test modules such as `android_test` use the `host_required` attribute to include additional harness dependencies. For example, `CtsLibcoreTestCases` references `cts-dalvik-host-test-runner` in the `host_required` attribute since those jars are required by Tradefed at runtime.

This information needs to present in module_info.json and exported to properly generate Bazel targets that include these runtime dependencies.

Test: m out/target/product/coral/module-info.json
Bug: 220991354
Change-Id: I8d2ab0da04c9f4aff17d290999c69ffe0534729f